Input: sun4i-ts - add thermal zone sensor support

The touchscreen controller has a temperature sensor embedded in the SoC,
which already has hwmon support in the driver.

Add DT thermal zone support so we can use it with cpufreq for thermal
throttling.

This also adds a comment stating that we do not know the actual formula
for calculating the temperature.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Eduardo Valentin <edubezval@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt b/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt
index aef57791f40b9aa5e56f28365a5b574c6cc8767b..a8405bab6c00573d3603e074048124e296c0b616 100644 (file)
--- a/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt
+++ b/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt
@@ -5,6 +5,7 @@ Required properties:
  - compatible: "allwinner,sun4i-a10-ts"
  - reg: mmio address range of the chip
  - interrupts: interrupt to which the chip is connected
+ - #thermal-sensor-cells: shall be 0
 
 Optional properties:
  - allwinner,ts-attached: boolean indicating that an actual touchscreen is
@@ -17,4 +18,5 @@ Example:
                reg = <0x01c25000 0x100>;
                interrupts = <29>;
                allwinner,ts-attached;
+               #thermal-sensor-cells = <0>;
        };

diff --git a/drivers/input/touchscreen/sun4i-ts.c b/drivers/input/touchscreen/sun4i-ts.c
index 28a06749ae42b77c9dc1425af525eef1a7590238..9ae53d4289fb740d073ffc9384a2ff66158a2a7e 100644 (file)
--- a/drivers/input/touchscreen/sun4i-ts.c
+++ b/drivers/input/touchscreen/sun4i-ts.c
@@ -34,6 +34,7 @@
 
 #include <linux/err.h>
 #include <linux/hwmon.h>
+#include <linux/thermal.h>
 #include <linux/init.h>
 #include <linux/input.h>
 #include <linux/interrupt.h>
@@ -107,6 +108,7 @@
 struct sun4i_ts_data {
        struct device *dev;
        struct input_dev *input;
+       struct thermal_zone_device *tz;
        void __iomem *base;
        unsigned int irq;
        bool ignore_fifo_data;
@@ -180,16 +182,48 @@ static void sun4i_ts_close(struct input_dev *dev)
        writel(TEMP_IRQ_EN(1), ts->base + TP_INT_FIFOC);
 }
 
+static int sun4i_get_temp(const struct sun4i_ts_data *ts, long *temp)
+{
+       /* No temp_data until the first irq */
+       if (ts->temp_data == -1)
+               return -EAGAIN;
+
+       /*
+        * The user manuals do not contain the formula for calculating
+        * the temperature. The formula used here is from the AXP209,
+        * which is designed by X-Powers, an affiliate of Allwinner:
+        *
+        *     temperature = -144.7 + (value * 0.1)
+        *
+        * This should be replaced with the correct one if such information
+        * becomes available.
+        */
+       *temp = (ts->temp_data - 1447) * 100;
+
+       return 0;
+}
+
+static int sun4i_get_tz_temp(void *data, long *temp)
+{
+       return sun4i_get_temp(data, temp);
+}
+
+static struct thermal_zone_of_device_ops sun4i_ts_tz_ops = {
+       .get_temp = sun4i_get_tz_temp,
+};
+
 static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
                         char *buf)
 {
        struct sun4i_ts_data *ts = dev_get_drvdata(dev);
+       long temp;
+       int error;
 
-       /* No temp_data until the first irq */
-       if (ts->temp_data == -1)
-               return -EAGAIN;
+       error = sun4i_get_temp(ts, &temp);
+       if (error)
+               return error;
 
-       return sprintf(buf, "%d\n", (ts->temp_data - 1447) * 100);
+       return sprintf(buf, "%ld\n", temp);
 }
 
 static ssize_t show_temp_label(struct device *dev,
@@ -283,17 +317,27 @@ static int sun4i_ts_probe(struct platform_device *pdev)
        writel(STYLUS_UP_DEBOUN(5) | STYLUS_UP_DEBOUN_EN(1) | TP_MODE_EN(1),
               ts->base + TP_CTRL1);
 
+       /*
+        * The thermal core does not register hwmon devices for DT-based
+        * thermal zone sensors, such as this one.
+        */
        hwmon = devm_hwmon_device_register_with_groups(ts->dev, "sun4i_ts",
                                                       ts, sun4i_ts_groups);
        if (IS_ERR(hwmon))
                return PTR_ERR(hwmon);
 
+       ts->tz = thermal_zone_of_sensor_register(ts->dev, 0, ts,
+                                                &sun4i_ts_tz_ops);
+       if (IS_ERR(ts->tz))
+               ts->tz = NULL;
+
        writel(TEMP_IRQ_EN(1), ts->base + TP_INT_FIFOC);
 
        if (ts_attached) {
                error = input_register_device(ts->input);
                if (error) {
                        writel(0, ts->base + TP_INT_FIFOC);
+                       thermal_zone_of_sensor_unregister(ts->dev, ts->tz);
                        return error;
                }
        }
@@ -310,6 +354,8 @@ static int sun4i_ts_remove(struct platform_device *pdev)
        if (ts->input)
                input_unregister_device(ts->input);
 
+       thermal_zone_of_sensor_unregister(ts->dev, ts->tz);
+
        /* Deactivate all IRQs */
        writel(0, ts->base + TP_INT_FIFOC);